RPF files use custom headers and compression. Simply changing the extension will corrupt the data. You must extract the RPF contents first, then re-compress into ZIP.
OpenIV does not run natively on macOS/Linux. However, you can: rpf to zip
Q: What software do I need to convert RPF to ZIP? A: You can use ArcGIS, GDAL, or online conversion tools like CloudConvert or Convertio. RPF files use custom headers and compression
To do this, you need to extract the RPF into a normal folder (like a ZIP extraction), make your changes, and then rebuild the RPF. Many users prefer to work with a ZIP during the "editing stage" because ZIP files are universally supported. OpenIV does not run natively on macOS/Linux
This method is faster for multiple RPF files but requires command-line familiarity.
: Some modders prefer the .oiv (OpenIV Package) format, which is an automated installer that functions similarly to a zip but handles the placement of files within the game directory.